Malicious PDF — malware analysis report

Static analysis result for SHA-256 1073713b77412d02…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 02:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ff868deee2d9e83b9286c1e3076e299 SHA-1: 75d7ca2cc38f37d13ba31c87eaf330e813688baf SHA-256: 1073713b77412d02cebf5a231fbd43074645656257261dbcab4ee816d4210a37
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with one specifically flagged as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware delivery attempt. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely acting as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/gokulugirebakalozuzusali.pdf In PDF document text
    • http://www.companyforte.com/imagenes/editor/file/padenopifedapow.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/kuxelulewojogi.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/58051368175.pdfIn PDF document text
    • https://clinicscrm.com/img/files/gotewemojipiw.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/72428440992.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/votelowomuguxawatumomutiz.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/5b186fe49d96e135478013df49425cec/76959202107.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/turijoteworelado.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/xeloke.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109181415554007.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021091721351773499.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/28080643661.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/xumeze.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/74460137874.pdfIn PDF document text
    • https://brs.jo/userfiles/files/87319487170.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/revijabada.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/vibezutagifa.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/rugitadaxiruvutewasenowek.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/46020338576.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/43846327378.pdfIn PDF document text
    • http://suurelepa.ee/data/file/kovaxigigemogono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=message+bomber+app+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF0 18972 bytes
SHA-256: 2c12e028793ba63c9ab23acbcb8881e9798e2e0b3a9c9b26f910f0d2c1770fd8
font_02_sfnt_off00011cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF6 10764 bytes
SHA-256: 56b0ed10c5424017a18e435f0569a2c8e8d8ba516e050dcd3e7f21746ed53f27